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Power supply short circuit protection system with automatic restarting and soft-starting functions and protection method

A soft-start circuit, power supply short-circuit technology, applied in emergency protection circuit devices, output power conversion devices, electrical components, etc., can solve the problems of short-circuit protection malfunction, large overshoot, etc., and achieve the effect of large capacitive load capacity

Active Publication Date: 2014-09-03
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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  • Abstract
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Problems solved by technology

In the conventional power supply short-circuit protection system with soft-start function, the soft-start circuit can effectively prevent the overshoot of the input current only when the power supply is started. When the output terminal voltage returns to the normal value, the overshoot of the input current is larger than the overshoot of the input current when the power supply is started, especially when the capacitive load of the power supply is large, it is easy to trigger the short-circuit protection system to enter the protection state again, resulting in malfunction of the short-circuit protection

Method used

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  • Power supply short circuit protection system with automatic restarting and soft-starting functions and protection method

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 As shown, a power supply short-circuit protection system with automatic restart and soft-start functions includes a PWM controller 2 , a power supply circuit 3 , a soft-start circuit 4 , a reference voltage circuit 5 and a short-circuit protection circuit 6 . The PWM controller 2 is connected to the main power circuit 1 of the power supply. The main power circuit 1 is composed of an NMOS transistor Q0, a transformer T and a sampling resistor R0. The gate of the NMOS transistor Q0 is connected to the output terminal of the PWM controller, and the source of the NMOS transistor Q0 The sampling resistor R0 is grounded, and the drain of the NMOS transistor Q0 is connected to the power supply input voltage Vin through the primary winding of the transformer T.

[0025] The power supply circuit 3 is composed of a first zener di...

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Abstract

The invention provides a power supply short circuit protection system with automatic restarting and soft-starting functions and a protection method of the power supply short circuit protection system. The system comprises a PWM (Pulse Width Modulation) controller, a power supply circuit, a soft starting circuit and a short circuit protection circuit. The invention further provides the protection method of the power supply short circuit protection system with automatic restarting and soft-starting functions. According to the system, the automatic restarting of the power supply circuit and the automatic setting of the soft starting circuit are realized by utilizing the short circuit protection circuit, so that the phenomenon that short circuit protection circuit cannot return to normal because being triggered to enter a protection state again due to the inputting of surge currents after the short circuit protection is finished is effectively prevented. Thus, compared with the conventional hiccup-type short circuit protection circuit with the soft-starting function, the short circuit protection circuit provided by the invention has the large capacitive load capacity because the surge currents which are input are effectively inhibited, so that the short circuit protection circuit provided by the invention is suitable for various power supply systems.

Description

technical field [0001] The invention relates to the technical field of power supply short circuit protection, in particular to a power supply short circuit protection system and method with automatic restart and soft start functions. [0002] Background technique [0003] The short-circuit protection system is the core protection unit in the power system. Its function is to detect the short-circuit protection status in the power system and control the power supply to prevent damage to the power system caused by excessive current during short-circuit. In the conventional power supply short-circuit protection system with soft-start function, the soft-start circuit can effectively prevent the overshoot of the input current only when the power supply is started. When the output terminal voltage returns to the normal value, the overshoot of the input current is larger than the overshoot of the input current when the power supply is started, especially when the capacitive load of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/10H02M1/36H02M1/32
Inventor 胡海斌胡进张石磊刘猛
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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